def test_fragments_needed_all_parities_missing():
driver = StepEntangler(MockSource(),
1,
10,
3,
ec_type="liberasurecode_rs_vand")
with pytest.raises(ECDriverError) as excinfo:
driver.fragments_needed([10, 11, 12])
assert str(
excinfo.value
) == "Configuration of Step (s=1, t=10, e=2, p=3) does not allow for reconstruction of 3 missing blocks"
def test_fragments_needed_two_parities_missing():
driver = StepEntangler(MockSource(),
1,
10,
3,
ec_type="liberasurecode_rs_vand")
assert driver.fragments_needed([11, 12]) == [13]
def test_fragments_needed_all_available():
driver = StepEntangler(MockSource(),
1,
10,
3,
ec_type="liberasurecode_rs_vand")
assert driver.fragments_needed([]) == [11]
def test_fragments_needed_raises_ValueError_when_index_out_of_scope():
driver = StepEntangler(MockSource(),
1,
10,
3,
ec_type="liberasurecode_rs_vand")
with pytest.raises(ValueError) as excinfo:
driver.fragments_needed([-1])
assert str(excinfo.value) == "Index -1 is out of range(0 <= index < 14)"
assert driver.fragments_needed([0]) == [11]
assert driver.fragments_needed([13]) == [11]
with pytest.raises(ValueError) as excinfo:
driver.fragments_needed([14])
assert str(excinfo.value) == "Index 14 is out of range(0 <= index < 14)"